Door-alarm.



PATENTED SEPT. 5, 1905.

J. SWAN.

D005. ALARM.

APPLICATION FILED JAN.9,1905.

JAMES SWAN, OF SEYMOUR, (TONNICC'IIUUI.

DOOR-ALARM.

Specification of Letters Patent.

' :icnted Sept, 5, 1905.

Application filed January 9. 1905. Serial No. 240.195.

Be it known that I, Janus SWAN, a citizen ot' the United States, residing' at Seymour, county ot A\'ew Haven, State ot' (lonnecticut, have invented a new and useful [Mor-Alarm, ot' which the following' is a specilication.

Uy invention has for its object to provide a simple and inexpensive portable bell-alarm adapted tor temporary or permanent use that can be conveniently carried in a traveling-bag' and may be attached in an instants time to the shank ot' any door-knob in a verticallyuprig'ht or dependent position, the parts being' so combined and arrang'ed that oscillation ot' the knob-shank in either direction will cause the bell to ring'. It is ot course well understood that a device ot' this character in order to meet the requirements of g'eneral use must be simple and inexpensive to make, durable, easily attached and detached, and practically impossible to g'et out ot' repair.

\\'ith these ends in view I have devised the simple and novel portable dom-alarm which l will now describe and in which the only important item otl cost is the bell itselt'.

In the accompanying' d rawing's, forming' part ot' this spccilication, Figure 1 is a t'ront elevation ot my novel alarm detached; Fig'. 9., a side elevation showing' the alarm attached to a knob-shank in a vertically-uprig'ht position and ready for use, and Fig'. 3 isa front elevation illustrating' the operation ot' ring'- ing' the bell by oscillation ot' the knob.

My nevel alarm comprises three essential elements only-to wit, a bell, means lor attacl'ling' the bell to a knob-shank, and means t'or causing' the bell to ring' when the shank is oscillated.

1l) denotes a bell which may be an ordinary bicycle or call bell ot' any ot' the types in ordinary use and which is provided with an operating' member-in the present instance a push-pin, (indicated by 11.) As it is simply required lor the purposes ot my invention that lhe bell be provided with an operating' member t'or ringing' it, l have omitted all illustration ot the mechanism ot' the bell. In practice i have used and have found admirably adapted t'or the present use a bell in which the ring'ing' operation is performed b v a spring' normally locked ag'ainst action and released to ring' the bell by movement ot` the operating' member. Any other style of bell, however, may be substituted, it' preferred. The bel! is carried by a Istandard 12, which may be simply a strip otl metal, as shown in the drawing's, or may be made as ornate as may suit the taste ot' the manufacturer or the requirements ot' the trade. 13 denotes a clamp which is pivoted to the standard, as at 14. 'lhe special construction otl the clamp is ot' course immaterial so' tar as the principle otl the invention is concerned. ln the present instance I have shown one member as loosely riveted to the other, as at 15, and the two members as curved to adapt them to clasp a knob-shank and as drawn together to clamp a knob-shank or loosened to release it by means ot' a thumbscrew 16. The upper end ot' the clamp is provided with an angular' face 1T, which is adapted to eng'ag'e a correspond ing' t'ace upon a slide 18, which is secured to the standard, so as to move longitudinally thereon. In the present iustanceI have shown the slide as provided with slots 1%) and as secured to the standard by means otl screws Q0 passing' through the slots. rlhe slide is made just long' enoug'h so that one end closely engages the operating' member-in the present instance the head otl the push-pin H-and the angular lace at the other end closely eng'ag'es ang'ular laee 1T at the u pper end ol the clamp.

'lhe operation is as follows: The device is placed upon a krn'ib-shank and locked there by tightening' the set-screw ot' the clamp, the standard being' either in a vertically-uprig'ht position, as shown in the drawings, o1' a vertically-dependent position, as pret'erred. As soon as the knob-shank is oscillatcd in either direction the weight otl the bell will cause it to swing' the standard as far as it can g'oin that direction, the standard ol course swinging' freely on pivot 14C. The oscillation ot' the standard tln'oug'h the engagement ot' the ang'ular face at the lower end otl the slide with ang'ular face 17 at the upper end ot' the clamp will move the slide toward the bell, which movement ot' the slide will actuate the'operating' member and cause the bell lo ring'. Il a spring-bell is used, the bell will ot' course continue to ring' until the spring' runs down or until the knob returns to its normal position, which will place the standard in a vertical position ag'ain, either upright or dependent, and the outward movement ot the operating' member when the pressure is relieved will move the slide backward to its normal positionthat is, from tli(3,position shown in Fig'. 3 to the position shown in Fig'. l.

It should be noted that the slide is free. to move long'itudinally on the standard and that the operating' member of the bell is spring'- IOO ITO

actuated. Vhen the slide is moved inward by the swinging of the standard in either direction from a vertical position, the movement is against the spring-actuated operating member. As soon as the pressure upon the slide is relieved the operating member of course returns toits normal position and stops the ringing and in doingl so returns the slide to its normal position, as there is no opposing pressure on the slide.

Having thus described my invention, I claimt 1. A door-alarm comprising a bell having an operating member, a standard by which it is carried, a clamp to which the standard is pivoted and which is adapted for attachment to a knob-shank, a slide upon the standard which engages the operating member and the clamp, and corresponding angular engaging faces on the contiguous ends of the clamp and the slide, substantially as described.

2. In a door-alarm the combination with a bell having an operating member and a standard b v which it is carried, of a clamp to which the standard is pivoted and which is adapted to eng'age a knob-shank and a slide upon the standard engaging the operating member and the clamp, so that when the standard is swung in either direction from a vertical position, the weight of the bell will carry the standard out of alinement with the clamp and the slide will be caused to actuate the operating member.

3. In a door-alarm the combination with a bell having an operating member and a standard by which it is carried, of a clamp to which the operating member is pivoted, said clamp comprising two members adapted to clasp a knob-shank, and a thumb-screw by which they are locked thereto, and a slide upon the standard engaging the operating member and having an angular face at its lower end adapted to engage a corresponding face on the clamp, substantially as described, for the purpose specified.

In testimony whereotl I aiix my signature in presence of two witnesses.

JAMES SWAN.

Vitnesses:

R. R. HEALEY, i O. E. HURLBURT. 

